/*
 * Copyright (C) 2021 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.sentry.config;

import io.sentry.ILogger;
import io.sentry.SentryLevel;

import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

/**
 * Loads {@link Properties} from the `sentry.properties` file located on the classpath.
 *
 * @since 2021-06-02
 */
final class ClasspathPropertiesLoader implements PropertiesLoader {
    private final @NotNull String fileName;
    private final @NotNull ClassLoader classLoader;
    private final @NotNull ILogger logger;

    /**
     * constructor
     *
     * @param fileName fileName
     * @param classLoader classLoader
     * @param logger logger
     */
    public ClasspathPropertiesLoader(
        @NotNull String fileName, @NotNull ClassLoader classLoader, @NotNull ILogger logger) {
        this.fileName = fileName;
        this.classLoader = classLoader;
        this.logger = logger;
    }

    /**
     * constructor
     *
     * @param logger logger
     */
    public ClasspathPropertiesLoader(@NotNull ILogger logger) {
        this("sentry.properties", ClasspathPropertiesLoader.class.getClassLoader(), logger);
    }

    @Override
    public @Nullable Properties load() {
        try (InputStream inputStream = classLoader.getResourceAsStream(fileName)) {
            if (inputStream != null) {
                try (BufferedInputStream bufferedInputStream = new BufferedInputStream(inputStream)) {
                    final Properties properties = new Properties();
                    properties.load(bufferedInputStream);
                    return properties;
                }
            }
        } catch (IOException e) {
            logger.log(
                SentryLevel.ERROR,
                e,
                "Failed to load Sentry configuration from classpath resource: %s",
                fileName);
            return null;
        }
        return null;
    }
}
